GSM noise on mic input - SL808xT

Hi all,

Has anyone come across a problem where GSM noise is picked up on the mic line input when the SL808xT is transmitting at close to maximum power?

I’ve followed all the best practices outlined in the design guide, but somehow the noise is still being picked up. It’s only a problem in fringe coverage areas where the module has to transmit at high power.

I’d appreciate any tips on how to filter out this noise if possible.